The dye "Smoky Red" (SR) also reacts with NaOH(aq). You are in the lab and perform the following steps:Run1: 20 mL of SR stock solution (1.9 X 10-4 M) diluted to 100 mL 10 mL of NaOH stock solution (2.2 X 10-1 M) diluted to 100 mL at t=0, two above solutions are mixed SR Absorbance (Beer's Law constant = 1.2 X 105) is measured at 90 sec intervalsRun2:20 mL of SR stock solution diluted to 100 mL20 mL of NaOH stock solution diluted to 100 mL at t=0, two above solutions are mixedSR Absorbance is measured at 60 sec intervalsReciprocal plot of SR absorbance gives q2 = 30.6 X 10-2 sec-1 The reaction of Smoky Red with sodium hydroxide solution is found to occur with a pseudo rate constant q1 of 7.3 X 10-2 sec-1. After Run 2 when volume of sodium hydroxide is doubled, q2 = 30.6 X 10-2 sec-1. Assuming the reaction is second order with respect to the dye, what is k for this reaction?

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Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

The dye "Smoky Red" (SR) also reacts with NaOH(aq). You are in the lab and perform the following steps:

Run1:

20 mL of SR stock solution (1.9 X 10^-4 M) diluted to 100 mL
10 mL of NaOH stock solution (2.2 X 10^-1 M) diluted to 100 mL
at t=0, two above solutions are mixed
SR Absorbance (Beer's Law constant = 1.2 X 10⁵) is measured at 90 sec intervals

Run2:

20 mL of SR stock solution diluted to 100 mL
20 mL of NaOH stock solution diluted to 100 mL
at t=0, two above solutions are mixed
SR Absorbance is measured at 60 sec intervals
Reciprocal plot of SR absorbance gives q₂ = 30.6 X 10^-2 sec^-1

The reaction of Smoky Red with sodium hydroxide solution is found to occur with a pseudo rate constant q₁ of 7.3 X 10^-2 sec^-1. After Run 2 when volume of sodium hydroxide is doubled, q₂ = 30.6 X 10^-2 sec^-1. Assuming the reaction is second order with respect to the dye, what is k for this reaction?

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